Structure and Union
Ques 1. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
typedef struct str{
char * name[2]={"welcome", "good"};
int x=333;
float y=98.878;
char * name;
}p;
int main()
{
p s1;
printf("\n %s", s1.name[0]);
printf(" %d", s1.x);
return 0;
}
options:
A. welcome 333
B. good 333
C. Compile time error
D. ruin time error
Ques 2. what is the output for the following c program ?
#include <stdio.h>
#include <stdlib.h>
typedef struct str{
static int x;
float y;
}pstr;
int main()
{
pstr p;
p.x=32;
p.y=22;
printf("\n %d", p.x);
printf("\n %f", p.y);
return 0;
}
options:
A. compile time error
B. 32 22
C. run time error
D. 22 32
Ques 3. what is the output for the below program?
#include <stdio.h>
#include <stdlib.h>
union un{
int x;
float y =3434;
}uvar;
int main()
{
uvar.x=0x33ff;
printf("\n %x", uvar.x);
printf("\n %f", uvar.y);
return 0;
}
options:
A. 0x33ff, 3434
B. compile time error
C. 0x33ff 0.000
D. run time error
Ques 4. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
union un{
int x;
char y ;
char z;
}uvar;
int main()
{
uvar.x=0x3334;
uvar.y = 'A';
printf("\n %x", uvar.x);
printf("\n %c", uvar.y);
printf("\n %c", uvar.z);
return 0;
}
options:
A. 0x3334 A,A
B. 0X0A0A A,A
C. 0X3341 95 95
D. 0X3341 A A
Ques 5. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
union un{
int x;
char y ;
char z;
}uvar;
int main()
{
printf("\n %d", sizeof(uvar));
return 0;
}
options:
A. 6
B. 4
C. 8
D. 10
Ques 6. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
struct st{
int y;
union un{
int x;
char m ;
char z;
}unvar;
};
int main()
{
struct st svar;
svar.unvar.x=0x1244;
svar.y=0x4567;
printf("\n 0x%x", svar.y);
printf("\n 0x%x", svar.unvar.x);
printf("\n %c", svar.unvar.m);
printf("\n 0x%x", svar.unvar.z);
return 0;
}
options:
A. compiler error
B. runtime error
C. 0x4567 0x4567 g 67
D. 0x4567 0x1244 D 0x44
Ques 7. what is the output ?
#include <stdio.h>
#include <stdlib.h>
struct st{
int y;
union un{
int x;
char m ;
char z;
}unvar;
};
int main()
{
struct st svar;
printf("\n %d %d", sizeof(struct st), sizeof(union un));
return 0;
}
options:
A. compile time error
B. 8 4
C. 8 6
D. 4 4
Ques 8. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
struct st{
int y[4];
union un{
double x;
long m ;
char z[8];
}unvar;
};
int main()
{
struct st svar;
printf("\n 0x%x 0x%x", sizeof(struct st), sizeof(union un));
return 0;
}
options:
A. compile time error
B. 0x18 0x18
C. 0x18 0x8
D. runtime error
Ques 9. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
typedef struct st {
float average;
struct st ptr;
}svar;
int main()
{
svar sv;
sv.average=99.44;
sv.ptr=sv;
printf("\n %f", sv.ptr.average);
return 0;
}
options:
A. copile time error
B. run time error
C. 99.44
D. 99.00
Ques 10. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
typedef struct st {
float average;
char y;
}svar;
int main()
{
svar s1, s2;
s1.average=99.44;
s2.average=99.44;
if(s1==s2)
printf("\n %d", s1.average);
printf("\n struct var compare");
return 0;
}
options:
A. 99
B. struct var compare
C. 99.44
D. compile time error
Ques 11. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
union un {
char arr[4];
int avg;
}u1;
int main()
{
u1.avg=0;
u1.arr[2]='F';
u1.arr[3]='E';
printf("\n %s", u1.arr);
return 0;
}
options:
A. 0FE
B. nothing is printed
C. Compile time error
D. Garbage characters
Ques 12. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
union un {
char arr1[7];
char arr2[7];
}u1;
int main()
{
strcpy(u1.arr1, "good");
strcpy(u1.arr1, u1.arr2);
u1.arr2[4]='b';
printf("\n %s", u1.arr1);
printf(" %s", u1.arr2);
return 0;
}
options:
A. good goodb
B. compile time error
C. good bgood
D. run time error
Ques 13. If the system is little endian what is the output ?
#include <stdio.h>
#include <stdlib.h>
union un {
char arr1[2];
short svar;
}u1;
int main()
{
u1.svar=0x4567;
printf("\n 0x%x", u1.svar);
printf(" 0x%x 0x%x", u1.arr1[0], u1.arr1[1]);
return 0;
}
options:
A. 0x4567 0x67 0x45
B. 0x4567 0x45 0x67
C. runtime error
D. 0x4567 g E
Ques 14. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
union un {
int x;
short svar;
}u1;
int main()
{
register int i=0;
u1.x=0x4;
u1.svar = 0x2;
for(i=0; i<5; i++)
u1.svar /= 0x2*i;
printf("\n 0x%x", u1.svar);
return 0;
}
options:
A. runtime error
B. compile time error
C. 0
D. 0.5
Ques 15. what is the output for the below code?
#include <stdio.h>
#include <stdlib.h>
struct st {
int m,n,p;
}svar= {3, 5, 8};
int main()
{
svar.m+=2;
svar.n+=2;
svar.p+=2;
printf("\n %d %d %d ", svar.m, svar.n, svar.p);
return 0;
}
options:
A. 3 5 8
B. runtime error
C. 5 7 10
D. Compile error
Answers
1. C
2. A
3. B
4. D
5. B
6. D
7. B
8. C
9. C
10. D
11. B
12. A
13. A
14. A
15. C
